The Rules of Classic No.4: Determine Your Shade of Neutrals and Build Your Wardrobe Around Those Neutrals.Look at the veins on the inside of your wrist in natural light. If they appear blue or purple, you likely have cool undertones. If you have cool undertones, choose cooler neutrals like taupe, dove grey, or soft blues. If they appear green, you likely have warm undertones. If you have warm undertones, go for earthy tones like beige, camel, or warm grays. If they appear to be a mix of both, you may have combination undertones and can wear both warm and cool neutrals. (Similar gray blazer linked.) LTKSeasonal LTKOver40 LTKStyleTip